Fix inverted platform error condition.
Fix inverted platform error condition.

libmetrocoin/libmetrocoin-blockchain,libtetcoin/libtetcoin-blockchain,libtetcoin/libtetcoin-blockchain,bitprim/bitprim-blockchain-replier,libtetcoin/libtetcoin-blockchain,bitprim/bitprim-blockchain-replier,libmetrocoin/libmetrocoin-blockchain,libmetrocoin/libmetrocoin-blockchain